Scientists have made genetic modifications to cotton to increase its resistance to insect pests. According to farmers’ report, the amount of insecticide needed per acre to control insect pests was only slightly lower for those who tried the modified seed than for those who did not. Therefore, since the modified seed costs more than ordinary seed without producing yields of higher market value, switching to the modified seed would be unlikely to benefit most cotton farmers economically. <argument: the modified seed不会比the ordinary seed 更加economically> 条件： 1.the modified seed => insecticide少 2.the ordinary seed => seed便宜 结论： 1+2 => modified便宜？还是ordinary便宜？
Which of the following would it be most useful to know in order to evaluate the argument?
A. Whether farmers who tried the modified cotton seed had ever tried growing other crops from genetically modified seed. <是否try其他的crops，不能看出the modified seed 和 the ordinary seed之间的比较> B. Whether the insecticides typically used on ordinary cotton tend to be more expensive than insecticides typically used on other crops. <the ordinary seed 的杀虫剂是否比别的种类的杀虫剂贵？B正确的唯一解释就是，other crops包含the modified seed,这个感觉很怪... > C. Whether for most farms who grow cotton it is their primary crop <cotton是否是primary crop，和the modified seed 比the ordinary seed economically 没关系> D. Whether the farmers who have tried the modified seed planted as many acres of cotton, on average, as farmers using the ordinary seed did. <the modified seed的播种亩数，也the modified seed更economically 无关> E. Whether most of the farmers who tried the modified seed did so because they had previously had to use exceptionally large quantities of insecticide. <farmers选择用the modified seed，是因为the ordinary seed用的insecticide太多？ 这个选项考虑的是“farmer选择the modified seed的原因”。这个也很怪... > 想了半天也不知道选啥... B?E?白痴题
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发表于 2011-1-22 18:57:27
